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A026664 as a simple table

n a(n)
2 1
3 7
4 28
5 153
6 560
7 2966
8 10673
9 56210
10 201515
11 1061236
12 3803919
13 20060748
14 71971953
15 380215935
16 1365763452
17 7227382849
18 25993733480
19 137769744017
20 496083782822
21 2632999776887
22 9491248654850
23 50438628688359
24 181996447948504

[1,7,28,153,560,2966,10673,56210,201515,1061236,
 3803919,20060748,71971953,380215935,1365763452,
 7227382849,25993733480,137769744017,496083782822,
 2632999776887,9491248654850,50438628688359,
 181996447948504]

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Last modified September 27 06:29 EDT 2022. Contains 357052 sequences. (Running on oeis4.)